Error 'Undefined variable "hisFtrs" or class "hisFtrs".'

histFtrs = cell(6,1);
start = 1;
for i = 1 : 6
    
    histFtrs{i} = hist(idx(start:start+size(features{i},2)),nWords)';
      %normalize
      histFtrs{i} = histFtrs{i}./sum(hisFtrs{i});
end


I am getting error as 
Undefined variable "hisFtrs" or class "hisFtrs".

Error in checker (line 30)
      histFtrs{i} = histFtrs{i}./sum(hisFtrs{i});

If anyone can help

Answer 1

[Alex Mcaulley]

At least in those lines of code you haven't defined hisFtrs variable. Can it be histFtrs?? If this is not the answer please provide the full code

[Prayag Bhatia]

im{1} = rgb2gray(imread('C:\Users\prayag\check_500.jpg')) ;
im{2} = rgb2gray(imread('C:\Users\prayag\real2.jpg')) ;
im{3} = rgb2gray(imread('C:\Users\prayag\real3.jpg')) ;
im{4} = rgb2gray(imread('C:\Users\prayag\real4.jpg')) ;
im{5} = rgb2gray(imread('C:\Users\prayag\fake1.jpg')) ;
im{6} = rgb2gray(imread('C:\Users\prayag\fake2.jpg')) ;

detectFeatures = @(in) {detectSURFFeatures(in)}; 
regions = cellfun(detectFeatures,im);
extractAndTransposeFeatures = @(in,pts) extractFeatures(in,pts)';
features = cellfun(extractAndTransposeFeatures,im,regions,'UniformOutput',false);
figure;
for i = 1 : 6
    subplot(3,3,i);
    imshow(im{i});
    hold on;
    plot(regions{i});
end
%%Create a visual vocabulary with 20 words
nWords = 20;
%use kmeans for constructing the vocabulary.
[idx,centers] = kmeans([features{:}]',nWords);
%%BoF Feature Representation
histFtrs = cell(6,1);
start = 1;
for i = 1 : 6
    
    histFtrs{i} = hist(idx(start:start+size(features{i},2)),nWords)';
      %normalize
      histFtrs{i} = histFtrs{i}./sum(hisFtrs{i});
 end
%display histograms
figure;
for i = 1 : 6;
    subplot(3,3,i);
    bar(histFtrs{i});
end
%%Partition images into 2 sets using kmeans
idx = kmeans([histFtrs{:}]',2) ;

Here is the full code.

[Alex Mcaulley]

As I said before, your error is a typo in the line

histFtrs{i} = histFtrs{i}./sum(hisFtrs{i});

It should be:

histFtrs{i} = histFtrs{i}./sum(histFtrs{i});

Are you having more errors after changing this line?

[Prayag Bhatia]

Thanks Buddy , was a very silly mistake on my part.